I recently ran a project where some engineers in my department were reviewing records to identify where old copper services remained in the gas system. The intention was to find them and remove them.
These are some nifty keychains I made as presents to the team using copper pipe pulled out of the ground.
Flattened copper 
Leather getting punched 
Cut and Punched Leather 
The sewing beings
Done!
It's Curt! 